Overview of the disk positions around the best-fit position for visit 3 shown in the center with blue frame. The (x, y) position of the central pixel is given below in parenthesis and the corresponding disk limb is shown with the dotted yellow circle. Images are identical otherwise and all scaled and smoothed with 3 × 3 boxcar filter to enhance visibility. The disk position assumed in Roth et al. (2014b) is indicted by the orange frame. The reduced chi-squared for all pixels is shown for the best-fit position. For all other positions the relative decrease of chi-squared value is shown in percentage of the best-fit value. The image from the forward model used to find the best-fit position is shown to the right. Note: the images are shown in detector frame and not rotated, unlike in Figure 5.